From 294a57fbcbaaaff3c6401d3e9c1523e3dfa9f0e8 Mon Sep 17 00:00:00 2001
From: System Administrator <moises.silva@gmail.com>
Date: Wed, 25 May 2011 23:16:24 -0400
Subject: [PATCH] allow -1 as silence generation divisor to specify only zeroes
 silence

---
 src/include/switch_ivr.h   | 6 ++++++
 src/switch_ivr.c           | 8 +++++++-
 src/switch_ivr_originate.c | 4 +---
 src/switch_resample.c      | 5 +++++
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/include/switch_ivr.h b/src/include/switch_ivr.h
index 9b353f3ded..6df047e9cc 100644
--- a/src/include/switch_ivr.h
+++ b/src/include/switch_ivr.h
@@ -62,6 +62,12 @@ SWITCH_BEGIN_EXTERN_C struct switch_unicast_conninfo {
 };
 typedef struct switch_unicast_conninfo switch_unicast_conninfo_t;
 
+#define SWITCH_IVR_VERIFY_SILENCE_DIVISOR(divisor) \
+	do { \
+		if ((divisor) <= 0 && (divisor) != -1) { \
+			divisor = 400; \
+		} \
+	} while(0);
 
 /**
  * @defgroup switch_ivr IVR Library
diff --git a/src/switch_ivr.c b/src/switch_ivr.c
index 5a082763b2..81be1893f1 100644
--- a/src/switch_ivr.c
+++ b/src/switch_ivr.c
@@ -154,7 +154,13 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_sleep(switch_core_session_t *session,
 		return SWITCH_STATUS_SUCCESS;
 	}
 
-	if (ms > 100 && (var = switch_channel_get_variable(channel, SWITCH_SEND_SILENCE_WHEN_IDLE_VARIABLE)) && (sval = atoi(var))) {
+	var = switch_channel_get_variable(channel, SWITCH_SEND_SILENCE_WHEN_IDLE_VARIABLE);
+	if (var) {
+		sval = atoi(var);
+		SWITCH_IVR_VERIFY_SILENCE_DIVISOR(sval);
+	}
+
+	if (ms > 100 && sval) {
 		switch_core_session_get_read_impl(session, &imp);
 
 		if (switch_core_codec_init(&codec,
diff --git a/src/switch_ivr_originate.c b/src/switch_ivr_originate.c
index 92137ea5d8..33951d5a97 100644
--- a/src/switch_ivr_originate.c
+++ b/src/switch_ivr_originate.c
@@ -910,9 +910,7 @@ SWITCH_DECLARE(switch_status_t) switch_ivr_wait_for_answer(switch_core_session_t
 							ringback.silence = atoi(p);
 						}
 					}
-					if (ringback.silence <= 0) {
-						ringback.silence = 400;
-					}
+					SWITCH_IVR_VERIFY_SILENCE_DIVISOR(ringback.silence);
 				} else {
 					switch_buffer_create_dynamic(&ringback.audio_buffer, 512, 1024, 0);
 					switch_buffer_set_loops(ringback.audio_buffer, -1);
diff --git a/src/switch_resample.c b/src/switch_resample.c
index 9c7f9b95d2..7355384915 100644
--- a/src/switch_resample.c
+++ b/src/switch_resample.c
@@ -190,6 +190,11 @@ SWITCH_DECLARE(void) switch_generate_sln_silence(int16_t *data, uint32_t samples
 
 	assert(divisor);
 
+	if (divisor == (uint32_t)-1) {
+		memset(data, 0, sizeof(*data));
+		return;
+	}
+
 	for (i = 0; i < samples; i++, sum_rnd = 0) {
 		for (x = 0; x < 6; x++) {
 			rnd2 = rnd2 * 31821U + 13849U;